National Retired Teachers Association & American Association of Retired Persons. (1981). Learning about aging. American Library Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Retired Teachers Association و American Association of Retired Persons. Learning About Aging. Chicago: American Library Association, 1981.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Retired Teachers Association و American Association of Retired Persons. Learning About Aging. American Library Association, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.